package org.apache.maven.toolchain;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.util.HashMap;
import java.util.Map;

import org.apache.maven.execution.MavenSession;
import org.apache.maven.plugin.descriptor.PluginDescriptor;
import org.apache.maven.project.MavenProject;
import org.apache.maven.toolchain.model.ToolchainModel;
import org.codehaus.plexus.component.annotations.Component;
import org.codehaus.plexus.component.annotations.Requirement;
import org.codehaus.plexus.logging.Logger;

/**
 * @author mkleint
 */
@Component(role = ToolchainManager.class)
public class DefaultToolchainManager implements ToolchainManager {
  @Requirement
  Logger logger;

  @Requirement(role = ToolchainFactory.class)
  Map<String, ToolchainFactory> factories;

  public Toolchain getToolchainFromBuildContext(String type, MavenSession session) {
    Map<String, Object> context = retrieveContext(session);

    ToolchainModel model = (ToolchainModel) context.get(getStorageKey(type));

    if (model != null) {
      try {
        ToolchainFactory fact = factories.get(type);
        if (fact != null) {
          return fact.createToolchain(model);
        } else {
          logger.error("Missing toolchain factory for type: " + type + ". Possibly caused by misconfigured project.");
        }
      } catch (MisconfiguredToolchainException ex) {
        logger.error("Misconfigured toolchain.", ex);
      }
    }

    return null;
  }

  Map<String, Object> retrieveContext(MavenSession session) {
    Map<String, Object> context = null;

    if (session != null) {
      PluginDescriptor desc = new PluginDescriptor();
      desc.setGroupId(PluginDescriptor.getDefaultPluginGroupId());
      desc.setArtifactId(PluginDescriptor.getDefaultPluginArtifactId("toolchains"));

      MavenProject current = session.getCurrentProject();

      if (current != null) {
        // TODO: why is this using the context
        context = session.getPluginContext(desc, current);
      }
    }

    return (context != null) ? context : new HashMap<String, Object>();
  }

  public static final String getStorageKey(String type) {
    return "toolchain-" + type; // NOI18N
  }

}
